CN201740864U - Digital electric energy meter check device based on simulate traceability method - Google Patents
Digital electric energy meter check device based on simulate traceability method Download PDFInfo
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- CN201740864U CN201740864U CN2009202367185U CN200920236718U CN201740864U CN 201740864 U CN201740864 U CN 201740864U CN 2009202367185 U CN2009202367185 U CN 2009202367185U CN 200920236718 U CN200920236718 U CN 200920236718U CN 201740864 U CN201740864 U CN 201740864U
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Abstract
A digital electric energy meter check device based on simulate traceability method is used for testing the accuracy of the electric energy meter based on IEC61850 standard and comprises an AC signal conditioning board, a central board, an industrial computer, and a linear power panel for supplying power for the device, wherein the AC signal conditioning board converts three-phase voltage and three-phase current provided by a circumscribed standard power source into voltage signals meeting range limit of an AD analog-to-digital converter of the rear central board in a front end low distortion manner; the central board achieves the functions of AC signal sampling, electrical energy accumulation, IEC61850 standard communication, error calculation, and data exchange of the industrial computer; and the industrial computer is used for developing a human-computer interface, and fulfilling the functions of giving commands, data communication and result display, and exchanging commands and data with a serial port through the central board. The accuracy of the check device reaches grade 0.05, and the magnitude can directly trace to the present national standard in higher grade.
Description
Technical field
The utility model relates to a kind of electric energy meter checking device, relates in particular to a kind of digital electric energy meter checking device based on analog source tracing method, is used for the electric energy meter error test based on the IEC61850 standard that digital transformer substation is used.
Background technology
As electric energy measuring equipment, digital electricity meter based on the IEC61850 standard also is not used for transformer station or power plant on a large scale, its very important reasons be that disappearance is carried out the effective means of error testing to digital electricity meter, so-called effectively means must possess two conditions: the one, and calibration equipment can be exported the data that meet the IEC61850 standard and give tested electric energy meter, and receive the electrical energy pulse of tested electric energy meter, measure the error of tested electric energy meter; The 2nd, the accuracy class of calibration equipment is at least 0.05 grade, but and precision have traceability.
Domestic electric energy meter producer and part scientific research institutions have carried out the calibration technology research of tracing to the source based on numeral, the ultimate principle of this technology is: digital signal generator of calibration equipment internal simulation, the benchmark of signal generator is one group of mathematical model, calibration equipment sends to tested electric energy meter with the output of signal generator by IEC61850 standard framing, receive the electrical energy pulse of tested electric energy meter output simultaneously, compare electric flux and benchmark electric flux that electrical energy pulse is represented, promptly obtained the error of tested electric energy meter.The subject matter of this technology is that the precision of the benchmark of signal generator itself can't pass by the national standard amount of carrying out, and that is to say that the precision of calibration equipment can only rely on the assurance of design side, and can't use third-party means to examine and determine.
The utility model content
The purpose of this utility model just is to provide a kind of digital electric energy meter checking device based on analog source tracing method, and the value of calibration equipment can directly be traced up to more high-grade existing national standard, is 0.01 grade COM3000 standard electric energy meter as precision.
For realizing above-mentioned utility model purpose, the utility model provides a kind of digital electric energy meter checking device (seeing the frame of broken lines part of accompanying drawing 1), comprises AC signal conditioning plate 2, central control board 3, industrial computer 4 that has data line to connect successively and the linear power supply plate 5 of powering to device.It is characterized in that:
Needed three-phase voltage, three-phase current carried out the conversion of front end low distortion when 2 effects of described AC signal conditioning plate were magnitude tracing that external calibration power source 1 is provided and virtual load test, be converted to the voltage signal of the AC sampling quantity of units limit that satisfies in the central control board of back, AC signal conditioning plate 2 comprises current regulating loop, current range switching controls loop and voltage conditioning loop:
In the current regulating loop, central control board dynamically changes an ampere turns of zero-flux current transformer according to the amplitude size of input current.Because the switch on and off finite capacity of relay, therefore form a group relay with two switch in parallel, a shared control signal, the ac current signal of every input mutually is through three group relaies, enter zero-flux current transformer, number of turn of zero-flux current transformer is divided four gears, has four taps and a common port; First group relay is preceding, and its output port A is connected with the input end of second group relay, output port B is connected with the input end of the 3rd group relay, and four output ports of second, third group relay connect the tap of zero magnetic flux mutual inductor; The secondary output of zero magnetic flux mutual inductor inserts a current/voltage translation circuit, and translation circuit is provided with a high precision operating amplifier, is connected with a precision resister between negative input end and the output terminal;
Current range switching controls loop contains two chip for driving, be used to drive totally 9 group relaies in three-phase current loop, wherein first chip for driving is used to drive the relay of A phase and the switching of B phase current range, and second chip for driving is used to drive the relay that C phase current range switches; The control input of two chip for driving is the control signal from central control board and the isolation of process photoelectricity;
Voltage conditioning loop act as with the alternating voltage low distortion of calibration power source output be converted to 5V with interior low voltage signal, deliver to the AC sampling unit in the central control board again; The voltage signal of input is at first through a resistance pressure-dividing network, potential-divider network is made up of three precision resistances, be connected to a programmable gain instrument amplifier through the voltage after partial signal, the control signal of amplifier is from central control board, and the output voltage signal of amplifier is delivered to the AC sampling unit of central control board.
Described central control board 3 finish function comprise AC sampling, electric energy accumulation, IEC61850 standard traffic, Error Calculation and with the exchanges data of industrial computer; Central control board can be divided into following several sections according to function:
1) power supply unit
The input voltage of power supply unit is 5V, takes from the linear power supply plate, and power supply unit contains power management chip and carries out voltage transitions, is converted to 3.3V, 1.25V and 1.8V voltage each unit for central control board respectively;
2) AC sampling unit
The effect of AC sampling unit is that the AC signal of simulation (characterizing three-phase voltage, electric current) is converted to digital signal synchronously, then digital signal is sent into digital signal processor DSP chip (following introduction); Analog to digital converter (AD) adopts has the eight passages conversion chip of conversion synchronously, and signal was handled through common mode conversion and anti-aliasing filter before delivering to analog to digital converter; Adopt the high-precision difference amplifier, input exchange signal is taken advantage of the common mode voltage of an input of stack behind the coefficient, the differential signal after the processing is delivered to analog to digital converter; The common mode voltage output of analog to digital converter is through giving differential amplifier behind the homophase follower, as the common mode voltage input of differential amplifier;
Three-phase current signal is delivered to the 1st to the 3rd input channel of analog to digital converter, and three-phase voltage signal is delivered to the 4th to the 6th input channel of analog to digital converter, and the reference voltage of analog to digital converter is from the Voltage Reference chip; Communicating by letter between analog to digital converter and dsp chip adopted the frame synchronization serial mode;
3) digital signal processor DSP unit
The digital signal processor DSP unit mainly comprises a digital signal processor dsp chip and peripheral clock circuit, core as central control board, the function of data acquisition, data processing and data transmission is realized in this unit, and its inside has arithmetic element, control module, storage unit, data bus and I/O interface; Dsp chip is connected with other unit by data line;
4) storage unit
Storage unit contains storer and flash chip, and storer is used for program code stored and real time data when dsp chip moves; Flash chip is used for program code stored and supplemental characteristic after the power down;
5) I/O unit
The I/O unit realizes that mainly the dsp chip external bus is multiplexing, and the RS232 communication interface between dsp chip and the industrial computer; The multiplexing mechanism of bus adopts code translator, rejection gate and latch, and the serial communication controller adopts optical coupling isolator to carry out level conversion;
6) electrical energy pulse unit
Central control board comprise two-way electrical energy pulse input port (be reactive energy input for active energy input) and two-way electrical energy pulse delivery outlet (one for active energy export, one be that reactive energy is exported).The electrical energy pulse of input carries out the impulse level conversion through optical coupling isolator, delivers to DSP at last through the conversion of two-stage drive device again; Electrical energy pulse from DSP is exported after one-level drives, and sends into the optical coupling isolator input end, and its output is after one-level drives, as the output pulse;
7) communication unit
The effect of communication unit is that three-phase voltage, the electric current when virtual load is tested the calibration power source exported send to tested electric energy meter with the frame that meets the IEC61850-9-1 standard; Or when real Road test, from merge cells reception real-time voltage, the current signal of electronic mutual inductor; This unit has two Ethernet RJ45 interfaces (electricity mouth) and two Ethernet optical fiber SC interfaces (light mouth), and electricity mouth and light mouth are controlled by ethernet controller, share a MAC Address, constitute communication unit; Electricity mouth and light mouth are controlled by ethernet controller, share a MAC Address, constitute communication unit, and the ethernet controller command interface is connected with dsp chip with data-interface.
The effect of described linear power supply plate is the DC voltage that the 220V alternating voltage of input is converted to the electron device use, amplifier in the AC sampling unit of signal regulating panel and central control board is ± the 15V power supply, the driving power of relay and photoelectric isolating device is+12V, analog to digital converter needs three voltage feds, simulation part 5V, digital signal processing kernel 1.8V, I/O interface 3.3V, ± 15V ,+12V and+the 5V power supply takes from the linear power supply plate; The linear power supply plate adopts one to have transformer and three bridge rectifier circuits a plurality of taps, the input of 220V alternating voltage.
4, described industrial computer is used to develop man-machine interface, finishes that order is assigned, data communication and Presentation Function as a result, with central control board by serial ports exchange command and data.The accessory parameter list of industrial computer is:
Beneficial effect: calibration equipment electric energy measurement precision of the present utility model has reached 0.05 grade, and precision can examine and determine by the traditional standard electric energy meter, has guaranteed the validity of test data.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is further elaborated.
Fig. 1 calibration equipment theory diagram;
Fig. 2 A-C signal regulating panel circuit theory diagrams;
The structured flowchart of Fig. 3 central control board;
Power unit circuit schematic diagram in Fig. 4 central control board;
Alternating current sampling circuit schematic diagram in Fig. 5 A-B central control board;
Storage unit circuit schematic diagram in Fig. 6 A-B central control board;
I/O element circuit schematic diagram in Fig. 7 A-C central control board;
Electrical energy pulse element circuit schematic diagram in Fig. 8 A-B central control board;
Figure 11 A-B linear power supply plate circuit theory diagrams;
Figure 12: magnitude tracing schematic diagram;
Figure 13: virtual load test philosophy figure;
Figure 14: real Road test schematic diagram.
Embodiment
The utility model is a calibration equipment, is applicable to the digital electricity meter based on the IEC61850 standard is carried out error testing, to determine whether satisfy nominal level as the electrical energy meter accuracy of electric energy measuring equipment.
As shown in Figure 1, digital electric energy meter checking device of the present utility model (seeing the frame of broken lines part of accompanying drawing 1) comprises AC signal conditioning plate 2, central control board 3, industrial computer 4 that has data line to connect successively and the linear power supply plate 5 of powering to device.
Referring to Fig. 2 A-C, needed three-phase voltage, three-phase current carried out the conversion of front end low distortion when the effect of described AC signal conditioning plate was magnitude tracing that external calibration power source is provided and virtual load test, be converted to the voltage signal of the AC sampling quantity of units limit that satisfies in the central control board of back, the AC signal conditioning plate comprises current regulating loop, current range switching controls loop and voltage conditioning loop:
In the current regulating loop, central control board dynamically changes an ampere turns of zero-flux current transformer according to the amplitude size of input current.Because the switch on and off finite capacity of relay, therefore form a group relay with two switch in parallel, a shared control signal, the every ac current signal of input mutually of A, B, C three-phase (0.2A～10A) through three group relaies, enter zero-flux current transformer, number of turn of zero-flux current transformer is divided four gears, has four taps and a common port.The corresponding relation of a number of turn of current range and mutual inductor is: corresponding 100 circles of 0.2A, corresponding 20 circles of 1A, corresponding 4 circles of 5A, corresponding 2 circles of 10A.If every group relay has an input end and two output port A and B.First group relay is preceding, and its output port A is connected with the input end of second group relay, output port B is connected with the input end of the 3rd group relay, and four output ports of second, third group relay connect the tap of zero magnetic flux mutual inductor.Each phase current range switches the relay status of usefulness and the corresponding relation of a number of turn of mutual inductor is:
The secondary output of zero magnetic flux mutual inductor inserts a current/voltage translation circuit, and translation circuit relates to a high precision operating amplifier, and model is OPA2277U, is connected a precision between negative input end and the output terminal and is 0.01% 500 ohm.According to the application scheme of its instructions, each gear current signal is transformed to the voltage signal that range is 5V.
Current range switching controls loop contains two chip for driving, model is LN2803, be used to drive totally 9 group relaies in three-phase current loop, wherein first chip for driving is used to drive the relay of A phase and the switching of B phase current range, and second chip for driving is used to drive the relay that C phase current range switches; The control input of two chip for driving is the control signal from central control board and the isolation of process photoelectricity, and the photoelectric isolating device model is PC817.
Voltage conditioning loop act as with 20～100V alternating voltage low distortion of calibration power source output be converted to low voltage signal in the 5V, deliver to the AC sampling unit in the central control board again; The voltage signal of input is at first through a resistance pressure-dividing network, and potential-divider network is made up of three precision resistances, and the precision resistance that potential-divider network is 5ppm by three precision is formed, and intrinsic standoff ratio is 5/405.Be connected to a programmable-gain instrumentation amplifier through the voltage after partial signal, the instrumentation amplifier model is PGA205AU, and the control signal of amplifier is from central control board, and the output voltage signal of amplifier is delivered to the AC sampling unit of central control board.
Referring to Fig. 3, described central control board finish function comprise AC signal sampling, electric energy accumulation, IEC61850 standard traffic, Error Calculation and with the exchanges data of industrial computer.Dsp chip adopts the Blackfin531 of U.S. AD company.Central control board can be divided into following several sections according to function:
1, power supply unit (see figure 4)
Power supply unit provides three power supplys for central control board, be respectively 3.3V, 1.25V and 1.8V, the input voltage of power supply unit is 5V, take from the linear power supply plate, power supply unit contains power management chip ADP3339, REG1117 and TPS73018 carries out voltage transitions, is converted to 3.3V, 1.25V and 1.8V voltage respectively.
2, sampling unit (seeing Fig. 5 A-B)
The effect of AC sampling unit is that the AC signal (three-phase voltage, electric current) that will simulate is converted to digital signal synchronously, then digital signal is transmitted into DSP.Analog to digital converter (AD) adopts has the eight passages conversion chip of conversion synchronously, and model is ADS1278.Signal requirement according to analog to digital converter before delivering to analog to digital converter is changed and anti-aliasing filter through common mode, the device that adopts is high-precision difference amplifier OPA1632, with the common mode voltage of a 2.5V level of input exchange signal multiplying factor 0.25 back stack, the output differential signal is delivered to analog to digital converter.The 2.5V common mode voltage output of analog to digital converter is through giving OPA1632 behind the homophase follower, as the common mode voltage input of differential amplifier.The peripheral circuit of OPA1632 is with reference to its instructions.Three-phase current signal is delivered to the 1st to the 3rd input channel of analog to digital converter, and three-phase voltage signal is delivered to the 4th to the 6th input channel of analog to digital converter.The reference voltage of analog to digital converter is from the Voltage Reference chip of a 2.5V, and model is ADR441.The peripheral circuit of analog to digital converter is with reference to its instructions.The frame synchronization serial mode is adopted in communicating by letter between analog to digital converter and DSP, with reference to the instructions of analog to digital converter chip and dsp chip.
3, storage unit (seeing Fig. 6 A-B)
Storage unit contains SDRAM storer and flash chip.SDRAM is used for program code stored and service data when dsp operation, and the chip model is MT48LC4M16A2TG-75IT.Flash chip is used for program code stored and data after the power down, and the chip model is SST39VF6401B-70-4C-EK.The method of attachment parametric device instructions of storage chip and DSP.
4, I/O unit (seeing Fig. 7 A-C)
The I/O unit realizes that mainly the DSP external bus is multiplexing, and the RS232 communication interface between DSP and the industrial computer.The multiplexing mechanism of bus adopts code translator SN74HC138D, rejection gate SN74HC02D and latch SN74AHCT573PWR.The serial communication controller is MAX232ESE, adopts optical coupling isolator 6N137 to carry out level conversion, and DSP side high level is 3.3V, and industry control pusher side high level is 12V.
5, electrical energy pulse unit (seeing Fig. 8 A-B)
Central control board comprise two-way electrical energy pulse input port (be reactive energy input for active energy input) and two-way electrical energy pulse delivery outlet (one for active energy export, one be that reactive energy is exported).Calibration equipment is when the magnitude tracing pattern, and central control board output active energy pulse or reactive energy pulse are to more high-precision electric energy standard scale, as COM3000; And when virtual load test and real Road test, central control board receives the active energy pulse and the reactive energy pulse of tested electric energy meter.This unit comprises two-way electrical energy pulse input channel and two-way electrical energy pulse output channel, the electrical energy pulse of input is through optical coupling isolator 6N137, and impulse level is converted to+5V, again through two-stage drive device SN74AHC1G14DBVR, impulse level is converted to+3.3V, delivers to DSP at last.Electrical energy pulse output is sent into optical coupling isolator PC817 input end after one-level drives, its output is after one-level drives, as the output pulse.
6, communication unit (seeing Fig. 9 A-D and Figure 10 A-C)
The effect of communication unit be when virtual load is tested with the three-phase voltage of calibration power source output, electric current with IEC61850-9-1 or-frame format of 9-2 standard sends to tested electric energy meter; Or when real Road test, from merge cells reception real-time voltage, the current signal of electronic mutual inductor.This unit has two Ethernet RJ45 interfaces (electricity mouth), and interface chip is 16ST8515; Two Ethernet optical fiber SC interfaces (light mouth), interface chip is RTL8201BL.Electricity mouth and light mouth are shared a MAC Address by ethernet controller (model is AX88796L) control, constitute communication unit 1 (Fig. 9 A-D).Electricity mouth and light mouth are shared a MAC Address by ethernet controller (model is AX88796L) control, constitute communication unit 2 (Figure 10 A-C).The command interface of ethernet controller is connected with dsp chip with data-interface.
Described industrial computer is used to develop man-machine interface, finishes that order is assigned, data communication, Presentation Function as a result, with DSP by serial ports exchange command and data.The accessory parameter list of industrial computer is:
Referring to Figure 11 A-B, the effect of linear power supply plate is the DC voltage that 220 alternating voltages of input is converted to the device electronics use.Amplifier in the AC sampling unit of signal regulating panel and central control board is ± the 15V power supply, the driving power of relay and photoelectric isolating device is+12V that AD converter needs three voltage feds, simulation part 5V, digital core 1.8V, I/O interface 3.3V.± 15V ,+12V and+the 5V power supply takes from the linear power supply plate, oneself design.The linear power supply plate adopts one to have transformer and three bridge rectifier circuits a plurality of taps, the input of 220V alternating voltage, and the linear power supply conversion chip has LM78H05,78H12, LM7815C and LM7915.1.8V voltage is taken from the power supply unit of central control board.
Calibration equipment has three kinds of mode of operations: one, the magnitude tracing of calibration equipment self; Two, calibration equipment carries out the virtual load test in the laboratory to electric energy meter; Three, calibration equipment carries out real Road test at the operation scene to electric energy meter.
One, magnitude tracing pattern (seeing Figure 12)
Magnitude tracing is whether to have reached 0.05 grade for the error of determining this calibration equipment.COM3000 is 0.01 grade a standard electric energy meter, and voltage is in parallel with calibration equipment, and electric current is connected with calibration equipment.Adopt part of standards power source (as the XL803 of Shenzhen star dragon company), industrial computer can be controlled the output in calibration power source, realizes automatic Verification.Fundamental diagram as shown in figure 12.
Two, virtual load test pattern (seeing Figure 13)
Carrying out the virtual load test in the laboratory, is whether to meet calibration value for the error that detects the measured number electric energy meter.After calibration equipment is gathered voltage, current signal from the calibration power source, form IEC61850 standard frame content, pass to tested electric energy meter by optical fiber cable, and receive the electrical energy pulse of tested table, the electric energy of accumulating with the internal standard electric energy meter of calibration equipment compares, thereby obtains the error of tested table.Adopt part of standards power source (as the XL803 of Shenzhen star dragon company), industrial computer can be controlled the output in calibration power source, realizes automatic Verification.Fundamental diagram as shown in figure 13.
Three, real Road test pattern (seeing Figure 14)
Real Road test is in transformer station or power plant electric energy meter to be carried out error testing, deliver to tested electric energy meter and calibration equipment simultaneously from synchronizing voltage, the current data of merge cells output, the electrical energy pulse of tested electric energy meter is also delivered to calibration equipment, is calculated the error of tested electric energy meter by calibration equipment.
Claims (3)
1. the digital electric energy meter checking device based on analog source tracing method comprises AC signal conditioning plate (2), central control board (3), industrial computer (4) that has data line to connect successively and the linear power supply plate (5) of powering to device, it is characterized in that:
Described AC signal conditioning plate (2) comprises current regulating loop, current range switching controls loop and voltage conditioning loop:
In the current regulating loop, because the switch on and off finite capacity of relay, therefore form a group relay with two switch in parallel, a shared control signal, the ac current signal of every input mutually is through three group relaies, enter zero-flux current transformer, number of turn of zero-flux current transformer is divided four gears, has four taps and a common port; First group relay is preceding, and its output port A is connected with the input end of second group relay, output port B is connected with the input end of the 3rd group relay, and four output ports of second, third group relay connect the tap of zero magnetic flux mutual inductor; The secondary output of zero magnetic flux mutual inductor inserts a current/voltage translation circuit, and translation circuit is provided with a high precision operating amplifier, is connected with a precision resister between negative input end and the output terminal;
Current range switching controls loop contains two chip for driving, be used to drive totally 9 group relaies in three-phase current loop, wherein first chip for driving is used to drive the relay of A phase and the switching of B phase current range, and second chip for driving is used to drive the relay that C phase current range switches; The control input of two chip for driving is the control signal from central control board and the isolation of process photoelectricity;
Voltage conditioning loop act as with the alternating voltage low distortion of calibration power source output be converted to 5V with interior low voltage signal, deliver to the AC sampling unit in the central control board again; The voltage signal of input is at first through a resistance pressure-dividing network, potential-divider network is made up of three precision resistances, be connected to a programmable-gain instrumentation amplifier through the voltage after partial signal, the control signal of amplifier is from central control board, and the output voltage signal of amplifier is delivered to the AC sampling unit of central control board.
2. digital electric energy meter checking device according to claim 1 is characterized in that: described central control board can be divided into following several sections according to function:
1) power supply unit
The input voltage of power supply unit is 5V, takes from the linear power supply plate, and power supply unit contains power management chip and carries out voltage transitions, is converted to 3.3V, 1.25V and 1.8V voltage each unit for central control board respectively;
2) AC sampling unit
The effect of AC sampling unit is that sign three-phase voltage, the electric current AC signal that will simulate are converted to digital signal synchronously, then digital signal is sent into the digital signal processor DSP chip; Analog to digital converter adopts has the eight passages conversion chip of conversion synchronously, and signal was handled through common mode conversion and anti-aliasing filter before delivering to analog to digital converter; Adopt the high-precision difference amplifier, input exchange signal is taken advantage of the common mode voltage of an input of stack behind the coefficient, the differential signal after the processing is delivered to analog to digital converter; The common mode voltage output of analog to digital converter is through giving differential amplifier behind the homophase follower, as the common mode voltage input of differential amplifier;
Three-phase current signal is delivered to the 1st to the 3rd input channel of analog to digital converter, and three-phase voltage signal is delivered to the 4th to the 6th input channel of analog to digital converter, and the reference voltage of analog to digital converter is from the Voltage Reference chip; Communicating by letter between analog to digital converter and dsp chip adopted the frame synchronization serial mode;
3) digital signal processor DSP unit
The digital signal processor DSP unit mainly comprises a digital signal processor dsp chip and peripheral clock circuit, and as the core of central control board, its inside has arithmetic element, control module, storage unit, data bus and I/O interface; Dsp chip is connected with other unit by data line;
4) storage unit
Storage unit contains storer and flash chip;
5) I/O unit
The I/O unit realizes that mainly the dsp chip external bus is multiplexing, and the RS232 communication interface between dsp chip and the industrial computer; The multiplexing mechanism of bus adopts code translator, rejection gate and latch, and the serial communication controller adopts optical coupling isolator to carry out level conversion;
6) electrical energy pulse unit
Central control board comprises two-way electrical energy pulse input port: one is the reactive energy input for active energy input, one, and two-way electrical energy pulse delivery outlet: one for active energy export, one be that reactive energy is exported; The electrical energy pulse of input carries out the impulse level conversion through optical coupling isolator, delivers to DSP at last through the conversion of two-stage drive device again; Electrical energy pulse from DSP is exported after one-level drives, and sends into the optical coupling isolator input end, and its output is after one-level drives, as the output pulse;
7) communication unit
This unit has two Ethernet RJ45 electrical interfaces and two Ethernet optical fiber SC optical interfaces, and electrical interface and optical interface are controlled by ethernet controller, shares a MAC Address, constitutes communication unit; Electrical interface and optical interface are controlled by ethernet controller, share a MAC Address, constitute communication unit, and the ethernet controller command interface is connected with dsp chip with data-interface.
3. digital electric energy meter checking device according to claim 2, it is characterized in that: the amplifier in the AC sampling unit of signal regulating panel and central control board is ± the 15V power supply, the driving power of relay and photoelectric isolating device is+12V, analog to digital converter needs three voltage feds, simulation part 5V, digital signal processing kernel 1.8V, I/O interface 3.3V, ± 15V ,+12V and+the 5V power supply takes from the linear power supply plate; The linear power supply plate adopts one to have transformer and three bridge rectifier circuits a plurality of taps, the input of 220V alternating voltage.
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| CN103885027A (en) * | 2014-03-24 | 2014-06-25 | 国家电网公司 | On-site quantity transmission device for electric energy meter |
| CN107064641A (en) * | 2017-06-09 | 2017-08-18 | 伍俊 | High-voltage insulating resistance online monitoring alarm instrument and method of work |
| CN107561473A (en) * | 2017-10-13 | 2018-01-09 | 广东电网有限责任公司电力科学研究院 | A kind of standard digital electric energy meter |
| CN114019202A (en) * | 2021-11-05 | 2022-02-08 | 国网江苏省电力有限公司营销服务中心 | Self-adaptive switching monitoring device and method for three-phase three-wire and three-phase four-wire mutual inductor |
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- 2009-09-30 CN CN2009202367185U patent/CN201740864U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103647682A (en) * | 2013-12-09 | 2014-03-19 | 北京航空航天大学 | Simulation system of simulating switched Ethernet clock synchronization |
| CN103647682B (en) * | 2013-12-09 | 2016-08-10 | 北京航空航天大学 | A kind of analogue system simulating the synchronization of switching Ethernet clock |
| CN103885027A (en) * | 2014-03-24 | 2014-06-25 | 国家电网公司 | On-site quantity transmission device for electric energy meter |
| CN103885027B (en) * | 2014-03-24 | 2016-08-17 | 国家电网公司 | A kind of electric energy meter field transmission of quantity value device |
| CN107064641A (en) * | 2017-06-09 | 2017-08-18 | 伍俊 | High-voltage insulating resistance online monitoring alarm instrument and method of work |
| CN107561473A (en) * | 2017-10-13 | 2018-01-09 | 广东电网有限责任公司电力科学研究院 | A kind of standard digital electric energy meter |
| CN114019202A (en) * | 2021-11-05 | 2022-02-08 | 国网江苏省电力有限公司营销服务中心 | Self-adaptive switching monitoring device and method for three-phase three-wire and three-phase four-wire mutual inductor |
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